Ella Turkington, 5, has intractable epilepsy and autism. Her parents Kim and Rob Turkington administers cannabidiol (CBD) oil in conjunction with her pharmaceuticals - as more families are experimenting with pediatric cannabis - to treat her epilepsy.

Mention Taylor Swift and five-year-old Ella’s eyes light up like the Christmas tree in the corner of her Surrey living room.

The tree scrapes the ceiling, and Ella is eager to play with the decorations, but her parents have set up a barricade so she can’t reach the branches.

That’s because the young girl has severe epilepsy and autism, and, although she is nearly six, the cognitive ability of a toddler.